19892138 has 12 divisors (see below), whose sum is σ = 34709922. Its totient is φ = 8525160.

The previous prime is 19892113. The next prime is 19892149. The reversal of 19892138 is 83129891.

It can be written as a sum of positive squares in only one way, i.e., 18774889 + 1117249 = 4333^2 + 1057^2 .

It is a super-2 number, since 2×19892138² = 791394308422088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19892095 and 19892104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101393 + ... + 101588.

Almost surely, 2^19892138 is an apocalyptic number.

19892138 is a deficient number, since it is larger than the sum of its proper divisors (14817784).

19892138 is a wasteful number, since it uses less digits than its factorization.

19892138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202997 (or 202990 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 19892138 is about 4460.0603134935. The cubic root of 19892138 is about 270.9529109415.

The spelling of 19892138 in words is "nineteen million, eight hundred ninety-two thousand, one hundred thirty-eight".